Hank Hall was originally the superhero Hawk, of Hawk and Dove. Hawk represented "chaos", while Dove represented "order". His brother, Don Hall, the original Dove, died during Crisis on Infinite Earths. Don was replaced with Dawn Granger, who mysteriously acquired her powers in London.[1]

Monarch was an oppressive tyrant from a bleak, dystopian Earth fifty years in the future. The people were unhappy with his rule, particularly a scientist named Matthew Ryder, an expert on temporal studies, who was convinced he could use his technology to travel back in time and prevent the maniacal ruler from ever coming to power. He learned that forty years ago, one of Earth's strongest and most powerful heroes would eventually turn evil and become Monarch, and ten years from that event he would conquer the world. During a time travel experiment, Matthew was transformed into a being called "Waverider", and began searching the timestream for the hero who would become Monarch, not knowing that Monarch was following him. When Monarch came into battle with the heroes of the present day, he killed Dove, and her enraged partner killed him for it. Removing the villain's mask, Hank discovered that he was Monarch, and donned the armor.[1]

Armageddon 2001 is generally disliked by readers for what has been described as the dishonesty of its resolution. The frame story had been presented as a mystery - what superhero would go insane, kill all other heroes, and take over the world, and why? - and clues were provided. However, at some point during the mini series the future-culprit's identity was leaked. Captain Atom would be the one who became Monarch. In response to the leak, the surprise ending was changed at the last minute: Monarch was revealed to be, not Captain Atom, but rather Hawk. The problem with this reveal as many fans pointed out is that Waverider had seen Monarch die and let Hank Hall kill him in which then he absorbed his powers thus allowing him to destroy the JLA.

When hostile aliens encounter Monarch and Captain Atom in the past (sometime between 230 and 65 million years ago), they attempt to enlist both (with each figure having no knowledge of the other involved) to assist them in creating a wormhole. The wormhole's creation would destroy the universe in which the primitive Earth existed, but would allow the aliens to travel freely.

Shortly after returning to the present, Monarch confronted Waverider and used his power to see the past and future to become aware of the power within him. It is explained at this point, that when Monarch killed Dove, her powers went directly into Hawk. Realising this, Monarch unleashes his hidden powers to become Extant, although killing Dove lowers his power by 75% and does not allow him to be enraged. Extant then removes the Waverider's time-traveling device and joins forces with renegade Green LanternHal Jordan, now known as Parallax, in a plan to alter time as they saw fit (as seen in Zero Hour).[1]

His first act was to alter the future so that he could have a metahuman army at his disposal, mostly consisting of members of the Teen Titans; his plan was to amass an army so powerful that no one could interfere with his efforts to control time itself. Several armies of heroes banded together to stop his plans before they began in the 30th century, and altered history so that his followers never came to exist in the future.

Down, but not out, Extant began to strike back at the heroes at Ground Zero, the beginning of time. Parallax had warped several metahumans from various time periods together for the ultimate assault, and Extant hit the Atom with a chronal blast, de-aging him into a teenager. Sensing defeat was imminent, he escaped the fight, promising vengeance at a later date.

Extant would first reappear in the 1999 one-shot, "Impulse: Bart Saves the Universe."[2] In it, Extant picks a fight with the original Justice Society as a means of tricking the Linear Men into saving the life of an innocent bystander who was destined to die. The man they saved would now go on to develop a nuclear weapon that, when tested, would shift the Earth out of its proper orbit, causing massive changes in the timelines of some of Earth's greatest heroes. Among these changes, Hal Jordan never becomes Green Lantern, thus he never becomes Parallax, and never stops Extant from destroying all of time. Fortunately for the citizens of time, Impulse arrives and is barely able to defeat Extant and prevent the Linear Men from saving the doomed scientist.

He would engage the Justice Society again on a later date as he sought to acquire the reality-warping power of the Worlogog, recently dismantled by Hourman because he feared its power. Although Extant succeeded in his goal with the aid of Metron's stolen Mobius Chair, Doctor Fate learned from the imprisoned Mordru that when Hourman had dismantled the Worlogog, he had retained a small fragment of it, thus creating infinitesimal flaw in the prime Worlogog that the JSA could exploit.

After the resurrected Dove sacrificed herself to distract Extant, Hourman divided his Hour of Power amongst his teammates, thus granting them all immunity to Extant's reality warping powers for four minutes, each of them attacking him on a different temporal plane until they were able to separate him from the Worlogog. Following this setback, Extant again attempted to escape. Instead, Extant was teleported by Hourman and Metron, at Atom Smasher's behest, into the seat of an airplane whose crash Kobra had caused earlier (in his relative timestream). As a result of this, Atom Smasher's mother was saved (as she was on the plane when it crashed), but Atom Smasher replaced his mother with a weakened Extant, saving her life but murdering the super villain to stop his threat and ensure that the same number of people died on that plane who had died originally.

In response to fan-criticism of Armageddon 2001, many of whose readers felt that the character of Hawk had been severely misused in the story's last-minute changes, DC Comics set about restoring the character as he had originally been intended; a hero. DC had already retconnedExtant's portion of Hank Hall's timeline in issue 14 of JSA, dated September 2000, in which Metron announced his intention to erase the villain's "wretched timeline" with his Mobius Chair. This was the second issue of a 3-part story entitled The Hunt for Extant!, (the details of which are listed above). After this, DC also retconned Monarch's portion of Hall's timeline with the final issue of the 6-part miniseries The Battle for Blüdhaven, dated September 2006, which now depicted Captain Atom's transformation into Monarch, as had been DC's original intention back in 1991. Hawk was restored, but he would not be revived until the final issue of Blackest Night.

In the Blackest Night crossover, Hank Hall is reanimated as a member of the undead Black Lantern Corps. The black power rings also try to reanimate his brother Don, but are denied, stating "Don Hall of Earth at Peace."[3] Hank then tracks down and attacks Dawn and the new Hawk, her sister Holly. After a short battle, Hank rams his hand into Holly's chest, ripping her heart out, and using it to charge his ring.[4] Holly's body is then revived by a black ring, and the two attack Dawn together. Severely outmatched, Dawn retreats, with Hank and Holly giving chase.[5] Hank and Holly follow Dawn to Titans Tower, where more Black Lantern Titans are attacking the living heroes. The two eventually overwhelm Dawn, with Holly plunging her hand into Dawn's chest. Dawn suddenly radiates a white energy that completely destroys Holly's body and ring. The other Black Lanterns, seeing Dawn as their greatest threat, attack her. However, she turns the light on them, destroying all but Hank, Tempest, and Terra, who quickly retreat.[6] While battling the Black Lanterns at Coast City, Hank is later brought back to life by the power of the white light.[7] Dawn has a vision of Don Hall, who tells Dawn that she can save Hank, and to not give up on him.[6]

At the beginning of the Brightest Day event, Hank and Dawn begin working together again as a crime-fighting duo. Dawn expresses worries over Hank's increasingly violent demeanor, but he simply brushes off her concerns.[8] While stopping an army of powerful teenaged super villains in Gotham City, Hank and Dawn are invited by Zinda Blake to join the Birds of Prey.[9] The two are immediately called by Oracle to help Black Canary and Huntress during their battle with a dangerous villainess known as the White Canary. Dove attempts to defeat her herself, but is surprised when White Canary is somehow able to dodge her attack and then draw blood from her.[10] Hank and Dawn later encounter Deadman, who Hank asks to resurrect Don.[11] At a crater in Silver City, New Mexico, Deadman attempts to revive Don, only to be prevented from doing so by the Entity.[12] As a number of onlookers (including Jackson Hyde) watch the Entity speak to the heroes, it instructs Hank to catch the boomerang that Captain Boomerang will throw at Dove.[13]

After being injured trying to kill himself because of depression, Hank Hall is sent to a hospital while his teammates plan their next move.[14] During his hospital stay, Hank has a vision of himself, clad in a White Lantern uniform and talking to Don. Just before the dream ends, Don assures his brother that he is at peace.[15] Later, Dawn is transported to the Star City forest by the Entity, Hawk unintentionally went with her, but when the "dark avatar" made his presence known, the Entity tells them that they must protect the forest and withstand the ultimate savior, which is Alec Holland.[16]

It was revealed that Captain Boomerang's mission for throwing the boomerang was to free Hawk as an avatar of war from the Lords of Chaos because his act of saving Dove would have broken their hold on him to be his own self. However, he failed to catch the boomerang and instead it was caught by Boston Brand, who ended up dying in the process and used his final act to move his white power ring to Alec Holland and bring back Swamp Thing and cleanse the Green from Nekron's influence.[17]

As Hawk he possessed a "danger sense transformation" which allowed him to change into a super-human with the powers of super strength, unlimited stamina, enhanced speed, enhanced agility, and enhanced durability. His partner Dove suppresses his violent nature, and without him or her Hank's rage becomes boundless.

As Monarch he possessed the same powers that he had as Hawk, along with a suit of highly durable armor that was crafted using advanced technology.

As Extant he had the powers of chronokinesis, energy projection, flight, and omniscience. After piecing together the Worlogog he became nigh-omnipotent.

While he was a member of the Black Lantern Corps, Hank wielded a black power ring which allowed him to generate black energy constructs. He was also able to perceive emotional auras. However, whilst he was able to perceive Holly's aura as red for rage, he saw Dawn's as a pure white that his ring could not identify. While wearing the black power ring it lowers his original power by over 50%.

An Animated version of Hawk (Hank Hall) was featured alongside Wonder Woman in an episode of Justice League Unlimited titled "Hawk and Dove", voiced by Jason Hervey. This version of the duo depicts a stronger relationship between the brothers. Don is more self-confident, and their philosophical bickering is more like a brotherly teasing. Ironically, there is a role reversal: Fred Savage (who played nerdy Kevin) voices the violent Hawk while Hervey (who played the bully Wayne) voices the pacifist Dove. They were originally to have voiced their more obvious roles, but tried switching during rehearsals, to the approval of the director. In this episode, their fighting styles were thoroughly contrasted. Hawk employs brute-force, aggressive tactics, at times resembling a football player. Dove, on the other hand, uses a blend of techniques reminiscent of aikido or perhaps judo, using his attacker's movements to fling them aside. Wonder Woman enlisted them to help stop Ares from causing war in Kaznia. They are successful due to Dove's peaceful resistance against the rage-powered Annihilator. This episode is another example of how close the two are, as Hawk struggles against Wonder Woman in an attempt to protect his brother. They are last seen in the series finale, "Destroyer", where they fight off Parademons alongside several other League members. They later appear in the final scene running down the steps of the Metro Tower with the rest of the League. Fittingly enough, both in that fight scene and as they exit in the finale of the episode, they appear along with fellow Steve Ditko creations the Question, the Creeper, and Captain Atom.

Hawk appears along with his brother Dove in the teaser for the Batman: The Brave and the Bold episode "When OMAC Attacks!", with Hawk voiced by Greg Ellis. They help Batman stop an intergalactic war between the Controllers and the Warlords of Okaara. While Hawk and Dove take out the ground forces, Dove claims that it is better to settle things diplomatically while Hawk says that they have to hurt them or they will never stop. Regardless, Batman gets the two sides' leaders to sign the peace treaty and end the war. Hawk and Dove do manage to embarrass themselves, their bickering causing them to fight in front of the leaders. Batman invites the leaders to have a drink in his ship to draw their attention from the bickering brothers. Hawk and Dove also briefly appear in the two-part episode "The Siege of Starro" Pt. 1 amongst the heroes who were taken over by Starro. After Starro's defeat, Hawk and Dove are transformed back to normal.

Hawk (Hank Hall) will appear in the series Titans as a member of the team and set to have a romantic pairing with the female Dove (Dawn Granger).[18]